Knowing how to write a will is a great idea if you have children under the age of 18, have recently gone through a divorce, and for a multitude of other reasons. Making a will when you still have all of your faculties will give you the peace of mind you need. If you need a will, here are some tips for how to write your own will, what it will cost if you pay a professional to write a will for you, and free legal will forms so you can write a living will yourself.